hard shudder during acceleration, cel blinking

[bearcat329]

having a prob, during light to hard acceleration, my 97 expedition just started shuddering pretty bad, the CEL is also blinking, been told a coil my have gone bad? does this sound right? the shuddering seems to come from under the seat area, maybe trans going south? has 127k on it.
tia,
Rick, Ore

[bearcat329]

turns out one of the coils went bad, the quoted price for a tuneup, i.e, new plugs and fuel filter is approx 250$, just FYI

[dasp]

Glad to know you found the problem. I have a question for you though. Before you replaced the coil pack, did you have to crank it a little longer to start it. Especially when it was cold. My Expedition shudders a bit when accelerating and I have to crank it a little longer for it to start. Both of these started happening at the same time. Did you check the coils yourself, if so how did you do it. Thanks.

[bearcat329]

yes, a little harder to start, obd-2 diagnostics reader is required to read the codes stored in the onboard computer, i just had the dealer do mine, parts cost approx 105 $, plus the labor and the diagnostics, total cost is approx 250 $ changing the spark plugs is also a pita, dealer recommended, and runs about 250 $ as well
so far i've had 2 coils go out in less then 2 weeks, uncommon, but not a rarity
hth,
Rick, Ore